Gonotheca — Gon o*the ca, n.; pl. {Gonothec?}. [NL., fr. Gr. ? offspring + ? box.] (Zo[ o]l.) A capsule developed on certain hydroids ({Thecaphora}), inclosing the blastostyle upon which the medusoid buds or gonophores are developed; called also {gonangium} … The Collaborative International Dictionary of English

Phylactocarp — Phy*lac to*carp, n. [Gr. ? to guard + ? fruit.] (Zo[ o]l.) A branch of a plumularian hydroid specially modified in structure for the protection of the gonothec[ae]. [1913 Webster] … The Collaborative International Dictionary of English